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Laboratory investigation of steel fibre reinforced sprayed concrete using a computed tomography method
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Concrete Structures.
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Concrete Structures. Sweco Energuide, Hydro Power & Dams, Stockholm, Sweden.
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Building Materials.
2018 (English)In: Eight International Symposium on SPRAYED CONCRETE - Modern Use of Wet Mix Sprayed Concrete for Underground Support, 2018, p. 24-38Conference paper, Published paper (Refereed)
Abstract [en]

A laboratory method for investigation of cored samples of steel fibre reinforced sprayed concrete (shotcrete) is described. A pilot study on computed tomography (CT) has been conducted, with focus on how the technique can be used for non-destructive testing where the cores remain intact after scanning and evaluation. The CT method require advanced integrated equipment for X-ray scanning and image detection, together with a computerized visualization system that can reproduce a threedimensional virtual, transparent model of the studied object. The method is well suited to describe orientation and distribution of steel fibres within the concrete. Interfaces between rock-concrete and concrete-concrete, between layers of differentsequences ofspraying, can also be identified. The results from the CT investigations can be presented as qualitative data that in 3D shows locations of steel fibres, aggregates, etc., and also as quantitative data showing relative distributions of cement paste, aggregates, steel fibres and voids, which is here demonstrated by a selection of examples. The method is well suited for practical analysis of sprayed concrete in situ specimens and it is recommended that it is established as a standard method for special inspections and performance evaluation of rock support in tunnels and subspace structures.

Place, publisher, year, edition, pages
2018. p. 24-38
National Category
Civil Engineering
Research subject
Civil and Architectural Engineering
Identifiers
URN: urn:nbn:se:kth:diva-235256OAI: oai:DiVA.org:kth-235256DiVA, id: diva2:1249382
Conference
8th International Symposium on Sprayed Concrete, Trondheim
Note

QC 20181008

Available from: 2018-09-19 Created: 2018-09-19 Last updated: 2018-10-08Bibliographically approved

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Ansell, AndersNordström, ErikGuarin, Alvaro
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CiteExportLink to record
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